Malicious PDF — malware analysis report

Static analysis result for SHA-256 47605bc46a7e96a3…

MALICIOUS

PDF

120.2 KB Created: 2021-07-08 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca416c68b49215d479c937e54544f096 SHA-1: c43c8c10ebb7aba0c347858edd88269d0b687184 SHA-256: 47605bc46a7e96a31ea22dc4276732adceb0cdab8291836f5b41263f50dbbb88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm or phishing campaign designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=are+polar+bears+warm+blooded+or+cold+blooded PDF link annotation
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/4f7ccf7e13efd505bc696aad46758571/zoviv.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/961dfmdqd5or9rc8sf8sofk81c/laradudalu.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b54cee31b5145fe6005edfe9ca4623e/zezeleveropaled.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/007o1tfppbu7qnc99n5dig7i52/jenojatukumotemip.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/63562329383.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa76f1f494---pivit.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/97251f1ec20005888bb46895d87fe3be/vosuli.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1a4f07662c6a375101750fe2f2104f6f/tagijobajisulizil.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/e9kal1rrbfbjcc11h8ucg39k11/85772373756.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107061150018390.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f6c91debaa66bcab6dc4524a6d896cdc/xasugetifedinaz.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/88937728021.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/63672906691.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/mozubivivekerexige.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061118553694.pdfIn PDF document text
    • http://ciskmv.com/css/file/52258203295.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/lageta.pdfIn PDF document text
    • http://iccarrentals.com/files/file/38611948370.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nuxemezekoz.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/joduvawirufovaguzuril.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/62e85719e0db030b779944c49b60aa26/85375404131.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160badc2184f4c---piboxidusupudanafaw.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/javonodusaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001706b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1706B 10588 bytes
SHA-256: 5d0a6bea26ee1348f24e4e53098d66033f8bfd1d70629f2bb7bacdd63ed61189
font_02_sfnt_off00018871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18871 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00019e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E4D 19008 bytes
SHA-256: f196679896e8bd171e5d84b643c1097527bab1a6f320f49c8a46358f7d890114

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